Feedback control of the line pressure during a downshift

Details Feedback control of the line pressure during a downshift Feedback control of the line pressure during a downshift

1997-02-19

1999-08-24

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477144, 477156, F16H 6126

Patent

active

059417960

ABSTRACT:
The shift control system and method for an automatic transmission of a vehicle, wherein the automatic transmission includes a hydraulic control system controlling a plurality of friction elements, senses vehicle operating conditions. Based on the sensed vehicle operating conditions, a control unit decides whether to perform a downshift from a higher speed stage to a lower speed stage. The control unit also feedback controls the hydraulic pressure in the hydraulic control system during the downshift when the control unit decides to perform such a downshift. The feedback control serves to lengthen the downshift operation such that shift shock is reduced.

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